Drilling & Countersinking

DRILLING AND COUNTERSINKING

WPW Tailor Made Solutions for decking and other joinery exterior and interior applications.

When joining 2 pieces of wood using screws, it is essential to predrill and countersink in order to achieve an esthetic and long lasting finish.

• Pilot hole – in the bottom board.
• Clearance hole and Countersink – in the top board

The pilot hole diameter should roughly match the root diameter of the screw. It can be slightly smaller for softwood. The clearance hole should be slightly larger than the diameter of the threads. For decking jobs, it is not usually necessary to pre-drill the bottom board, as it will always be hidden from view.